Hummock; heap (5)
I believe the answer is:
mound
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">hummock</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that hummock can be written as mound)</span><br/ ><br/ >'<span class="explanation-format__original">heap</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that heap can be written as mound)</span><br/ ><br/ ></span>
(Other definitions for mound that I've seen before include "Mass of piled-up earth or stones" , "Hillock; gold ball (Her.)" , "Small hill, large pile" , "Heap, hillock" , "Heap (of raised earth)" .)